Boiler-furnace.



PATENTED AUG. 18, 1908.

B. S. DE BALL.

BOILER FURNACE.

APPLICATION FILED JULY 18, 1907.

2 SHEETS-SHEET 1.

PATENTED AUG. 18, 1908.

B. S. DE BALL. BOILER FURNACE. APPLICATION FILED JULY 18, 1907.

2 SHEETSSHEET 2.

PATENT OFFICE.

BURTON S. DE BALL, CHICAGO ILLINOIS.

BOILER-FURNACE.

No. 896,440. Specification of Letters Patent. .1 Patented Aug. 18, 1908.

- Application filed July 18, 1907. Serial No. 384,423.

To all whom 'it may concern:

Be it known that I, BURTON S. DE BALL, a citizen of the United States,residing at Ohicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Boiler-Furnaces, ofwhich the following is a specification.

My invention relates to stationary steam boiler furnaces and the objectof my-invention is to provide a'furnace as mentioned, which will moreperfectly consume the fuel, to the end that a greater efliciency shallbe obtained from the quantity of fuel burned, thereby requiring lessfuel for a given amount of work and that the dischargeof-smoke from thefurnace shall be reduced to a minimum or entirely prevented.

Other objects will appear hereinafter.

With these objects in view my invention consists in a furnace of thenovel constructionand arrangements of parts all as will be hereinafterfully described and particularly pointed out in the claims.

My invention will be more readily understood by reference to theaccompanying drawings forming a part of this specification and in which,

Figure 1 is a vertical longitudinal section of a boiler furnaceembodying my invention in its preferred form, Fig. 2 is a horizontal lonitudinal section on the line, ac'm of Fig. 1, l ig. 3 is a transversesection of the line y-y of Fig. 2, Fig. 4 is a similar. section of theline 2-2 of the same figure and Fig. 5 is a detail sectional view onsubstantially the line, w-'w ofFig. 2.

Referring to the drawings, 1' indicates a boiler of any ordinary orpreferred; form. This is set in the usual masonry comprising the sidewalls, 2 the back wall, 3 and the front, 4.

5 indicates the furnace rate and. 6 the bridge ca ped with fire-brie 7.

Genera ly speaking my invention consists in injecting or spraylngsuperheated air into the furnace above the grate, insuch a mannor as tointimately mix a large quantity ofair with the normal products ofcombustion, consisting of gases and smoke. By superheating the airpreviously to injecting it into the furnace, the combustion is notretarded, as would be the case with cold air, no matter how great thequantity of air admitted; but to the contrary, the combustion is greatlyfacilitated. To accomplish this end, I provide air supply pipesextending substantially to the length of the furnace and located preferably in the hottest portion thereof, and connect, them with airspraying devices located in the front wall of the furnace and preferablybetween the fuel doors. As an auxiliary or supplementary air injector, Iprovide an air supply pipe extending transversely of the furnace throughthe bridge and equip the same with means for injecting small jets orstreams of air into the hot gases and smoke as they pass over thebridge.

Again referring to the drawings, 8 indicates the air supply pipescommunicating with the front air injector or sprayers. I have shown twosuch pipes, one on each side of the furnace, but wish it understood thatbut one pipe of sufficient size for an ample supply of air may be usedwithout departing from the scope of my invention. The pipes, 8*areembedded in the side walls, 2-, for protection, and so as not to reducethe combustion space; and are located close up to the boiler to receivethe greatest amount of heat in order that the air passing there throughshall be thoroughly superheated before reaching the sprayers. 1 The rearends are bent outwardly through the walls as at'9, to communicate withthe atmosphere, and at their forward ends are bent downwardly as at 10,to communicate with a transverse pipe, 11. The pipe, 11 is arrangedslightly above the tops of the fuel doors, 12 and is provided with downpipes, 13 extending into the air spray- "ers, 14.

The sprayers, 14 each comprise an iron box provided with an inwardextension, 15 which projects beyond the inner face of the wall, 4 andwhich is provided" with a large number of small holes, 16 formingnozzles through which the air is sprayed in all directions into theburning gases. The bottom of the pro- .jection, 15 is arched as shown tofacilitate removing or inserting the grate bars, 5, also to provide asuitable wall for the holes or jets 16 to direct the hot air downwardlyinto the gases. To facilitate the influx of air, a steam injector, 17may be provided, or the rear end of the pipe, 8 may be connected to ablower, 1 8. The front wall is of novel construction and will now bedescribed. 20 indicates the usual dead plate, arranged above the ash pitdoors, 21 andforming the bottom facing of the fuel doors, 12. Upon thedead late are placed the s rayers, 14. These iii the spaces between t edoors, 12 and their side walls form the side facings. of the fuel open-I into the furnace an bustion, practica ings. The liner 22 rests u onthe sprayers, 14, and is rovided with ugs, 2-3 which retain the mem ers,14 in lace. Above the liners, 22 and below the ead plate, thewall is ofthe usual masonry construction.

By injecting a large (iuarittitly of hot air in mm c ywith thepartially1 burned roducts of comy all of t e'smoke is consumed. However,some little especially from the rear end of the grate will pass overthebrid e, 6. In order to completely burn this sma residue of smoke, Iprovidean auxiliary air injector which will intimately mix a quantityof-hot air with the gases and remain ing smoke as they ass over thebridge.- Extending transverse y of the furnace, through the bridge, 6 isa pi e 25. This may be in communication wit the atmosphere at either orboth ends andis' rovided with a lar e'number of jets, 26. T e ipe 25isem j and the jets, 26 extend between'the bricks to be ded in the masonrybelow t e firebrick, 7

substantially a level wih the top of said bricks. The air mixed with thegases at this oint completes the combustion of the smoke.

here is no need of forcing the air through the'pipe, 25, as the rapidlymoving gases will mixing a.

a an. inwardly extendin create suflicient suction quantity of air.

Having described my invention what I claim as new and desire to secureby Letters Patent is: I

In a device of the class described, a boiler and its furnace, saidfurnace including the to draw in a large side walls and a front wallhavin the usualfuel openings, in combination wit a plural-. ity of airspraying devices forming the portion of said front wallbetweenand uponeach side of said openin s and forming the side facings' thereof, eacsaid device comprising a rectangularbox-like member provided with archedunderface over angingthe grate, a

pipe embedded in said front wall above said devices, a short downpipe,extend in from portion having an I said pipe into each of said sraying evices

